Expanded graphite embedded with aluminum nanoparticles as superior thermal conductivity anodes for high-performance lithium-ion batteries

Tingkai Zhao, Shengfei She, Xianglin Ji, Xinai Guo, Wenbo Jin, Ruoxing Zhu, Alei Dang, Hao Li, Tiehu Li, Bingqing Wei

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57 引用 (Scopus)

摘要

The development of high capacity and long-life lithium-ion batteries is a long-term pursuing and under a close scrutiny. Most of the researches have been focused on exploring electrode materials and structures with high store capability of lithium ions and at the same time with a good electrical conductivity. Thermal conductivity of an electrode material will also have significant impacts on boosting battery capacity and prolonging battery lifetime, which is, however, underestimated. Here, we present the development of an expanded graphite embedded with Al metal nanoparticles (EGMNPs-Al) synthesized by an oxidation-expansion process. The synthesized EG-MNPs-Al material exhibited a typical hierarchical structure with embedded Al metal nanoparticles into the interspaces of expanded graphite. The parallel thermal conductivity was up to 11.6 W•m-1•K-1 with a bulk density of 453 kg•m-3 at room temperature, a 150% improvement compared to expanded graphite (4.6 W•m-1•K-1) owing to the existence of Al metal nanoparticles. The first reversible capacity of EGMNPs-Al as anode material for lithium ion battery was 480 mAh•g-1 at a current density of 100 mA•g-1, and retained 84% capacity after 300 cycles. The improved cycling stability and system security of lithium ion batteries is attributed to the excellent thermal conductivity of the EG-MNPs-Al anodes.

源语言英语
文章编号33833
期刊Scientific Reports
6
DOI
出版状态已出版 - 27 9月 2016

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